| 内在几何学 | nèi zài jǐ hé xué | intrinsic geometry |
| 分形几何 | fēn xíng jǐ hé | fractal geometry |
| 分形几何学 | fēn xíng jǐ hé xué | fractal geometry |
| 向何处 | xiàng hé chù | whither |
| 射影几何 | shè yǐng jǐ hé | projective geometry |
| 射影几何学 | shè yǐng jǐ hé xué | projective geometry |
| 几何光学 | jǐ hé guāng xué | geometric optics |
| 几何原本 | Jǐ hé yuán běn | Euclid's Elements |
| 几何拓扑 | jǐ hé tuò pū | (math.) geometric topology |
| 几何拓扑学 | jǐ hé tuò pū xué | (math.) geometric topology |
| 几何线 | jǐ hé xiàn | geometric straight line |
| 几何量 | jǐ hé liàng | geometric quantity |
| 从何 | cóng hé | whence?; where from? |
| 微分几何 | wēi fēn jǐ hé | differential geometry |
| 微分几何学 | wēi fēn jǐ hé xué | differential geometry |
| 情何以堪 | qíng hé yǐ kān | how can this be endured! (idiom) |
| 意下如何 | yì xià rú hé | how about it?; what do you think? |
成也萧何，
败也萧何 | chéng yě Xiāo Hé ,
bài yě Xiāo Hé | raised up by Xiao He, cast down by Xiao He (idiom); success or failure depends solely on one individual |
| 成何体统 | chéng hé tǐ tǒng | What a scandal!; Whatever next? |
| 投影几何 | tóu yǐng jǐ hé | projective geometry; same as 射影几何 |
| 投影几何学 | tóu yǐng jǐ hé xué | projective geometry; same as 射影几何学 |
| 早知今日何必当初 | zǎo zhī jīn rì hè bì dāng chū | if I (you, she, he...) had known it would come to this, I (you, she, he...) would not have acted thus (idiom); to regret vainly one's past behaviour |
| 曾几何时 | céng jǐ hé shí | just a while before; not so long ago; everyone can remember when.. |
| 有宝何必人前夸 | yǒu bǎo hé bì rén qián kuā | there is no need to boast about one's treasures (idiom) |
欲加之罪，
何患无辞 | yù jiā zhī zuì ,
hé huàn wú cí | If you want to condemn sb, don't worry about the pretext (idiom, from Zuozhuan 左传); one can always trump up a charge against sb; Give a dog a bad name, then hang him. |
| 欧式几何 | ōu shì jǐ hé | Euclidean geometry |
| 欧式几何学 | ōu shì jǐ hé xué | Euclidean geometry |
| 欧氏几何学 | Ōu shì jǐ hé xué | Euclidean geometry |
杀鸡何必要用牛刀
呢 | shā jī hé bì yào yòng niú dāo ne | don't use a sledgehammer to crack a nut; de minimis non curat praetor (trivial matters are of no concern to a high official) |
| 没奈何 | mò nài hé | to have no alternative; to be helpless |
没有规矩，
何以成方圆 | méi yǒu guī jǔ ,
hé yǐ chéng fāng yuán | without rules, how can anything be done (idiom); one must follow some rules |
| 无论何事 | wú lùn hé shì | anything; whatever |
| 无论何人 | wú lùn hé rén | whoever |
| 无论何时 | wú lùn hé shí | whenever |
| 无论何处 | wú lùn hé chù | anywhere; wherever |
| 画法几何 | huà fǎ jǐ hé | descriptive Geometry (three-dimensional geometry using projections and elevations) |
| 缘何 | yuán hé | why?; for what reason? |
| 罗式几何 | luó shì jǐ hé | Lobachevsky's non-Euclidean geometry |
| 罗氏几何 | luó shì jǐ hé | Lobachevsky's non-Euclidean geometry |
| 解析几何学 | jiě xī jǐ hé xué | analytic geometry; coordinate geometry |
| 谈何容易 | tán hé róng yì | easier said than done (idiom) |
| 非欧几何 | fēi ōu jǐ hé | non-Euclidean geometry |
| 非欧几何学 | fēi ōu jǐ hé xué | non-Euclidean geometry |
| 黎曼几何 | Lí màn jǐ hé | (math.) Riemannian geometry |
| 黎曼几何学 | Lí màn jǐ hé xué | Riemannian geometry |
